The Urban Dictionary Mug

Often abbreviated to NSFW, it began as a label for media on the Internet such a pictures and music which had explicit content and you might not want your boss or teacher to find you surfing that stuff at school or work.

As of 2016 the label NSFW simply applies to anything that might be offensive or repulsive to some but not to others, whether it is actually Internet media or not.

It is the same taming down of words so you dont upset someone when they really need to understand what they are doing upsets people.